[web] improve error handling when setting/getting userID

Summary:

1. Making errors more descriptive
2. When we cannot not get userID we should delete database

Test Plan:

1. Throw errors from setting/getting userID and check if errors are printed.
2. Throw error from getting and make sure database is deleted

Reviewers: tomek, michal

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D10305